Novel higher-curvature variations of R2 inflation

Does Higher Inflation Lead to More Inflation Uncertainty? (The Case Of Iran)

Curvature Based Functions Variations

One of the methods of building the fundamentals of Differential Geometry is the shape operator approach and everything you could want to know about a surface’s curvature is locked up in the shape operator. In this work we consider the variation of the shape operator and the normal, the mean and the principals curvatures and, at last, the Willmore energy, under infinitesimal bending of surface g...

Preheating with non-minimally coupled scalar fields in higher-curvature inflation models

Takashi Torii ‡ Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152, Japan (June 4, 2005) In higher-curvature inflation models (R + αnR ), we study a parametric preheating of a scalar field χ coupled non-minimally to a spacetime curvature R (ξRχ). In the case of R-inflation model, efficient preheating becomes possible for rather small values of ξ, i.e. |ξ|∼ several. Although...

Higher Deficit Policies Lead to Higher Inflation

Generating the primordial curvature perturbation from inflation

The scale–independence of the primordial curvature perturbation suggests that it comes from the vacuum fluctuation during inflation of a light scalar field. This field may be the inflaton, or a different ‘curvaton’ field. The observation of primordial non–gaussianity would be a smoking gun for the curvaton model, while the observation of gravitational waves originating during slow–roll inflatio...